1 // SPDX-License-Identifier: GPL-2.0
6  * by the DRM_PANEL_SIMPLE driver because its power sequencing is non-standard.
10 #include <linux/delay.h>
67 	if (p->el3_was_on)  in atana33xc20_suspend()
68 		atana33xc20_wait(p->el_on3_off_time, 150);  in atana33xc20_suspend()
70 	ret = regulator_disable(p->supply);  in atana33xc20_suspend()
73 	p->powered_off_time = ktime_get();  in atana33xc20_suspend()
74 	p->el3_was_on = false;  in atana33xc20_suspend()
86 	atana33xc20_wait(p->powered_off_time, 500);  in atana33xc20_resume()
88 	ret = regulator_enable(p->supply);  in atana33xc20_resume()
91 	p->powered_on_time = ktime_get();  in atana33xc20_resume()
99 	if (p->no_hpd) {  in atana33xc20_resume()
102 	} else if (p->hpd_gpio) {  in atana33xc20_resume()
103 		ret = readx_poll_timeout(gpiod_get_value_cansleep, p->hpd_gpio,  in atana33xc20_resume()
117 	/* Disabling when already disabled is a no-op */  in atana33xc20_disable()
118 	if (!p->enabled)  in atana33xc20_disable()
121 	gpiod_set_value_cansleep(p->el_on3_gpio, 0);  in atana33xc20_disable()
122 	p->el_on3_off_time = ktime_get();  in atana33xc20_disable()
123 	p->enabled = false;  in atana33xc20_disable()
132 	p->el3_was_on = true;  in atana33xc20_disable()
147 	/* Enabling when already enabled is a no-op */  in atana33xc20_enable()
148 	if (p->enabled)  in atana33xc20_enable()
157 	 * non-obvious.  in atana33xc20_enable()
159 	if (WARN_ON(p->el3_was_on))  in atana33xc20_enable()
160 		return -EIO;  in atana33xc20_enable()
166 	atana33xc20_wait(p->powered_on_time, 400);  in atana33xc20_enable()
168 	gpiod_set_value_cansleep(p->el_on3_gpio, 1);  in atana33xc20_enable()
169 	p->enabled = true;  in atana33xc20_enable()
179 	/* Unpreparing when already unprepared is a no-op */  in atana33xc20_unprepare()
180 	if (!p->prepared)  in atana33xc20_unprepare()
184 	 * Purposely do a put_sync, don't use autosuspend. The panel's tcon  in atana33xc20_unprepare()
188 	 * NOTE: we still want autosuspend for cases where we only turn on  in atana33xc20_unprepare()
191 	ret = pm_runtime_put_sync_suspend(panel->dev);  in atana33xc20_unprepare()
194 	p->prepared = false;  in atana33xc20_unprepare()
204 	/* Preparing when already prepared is a no-op */  in atana33xc20_prepare()
205 	if (p->prepared)  in atana33xc20_prepare()
208 	ret = pm_runtime_get_sync(panel->dev);  in atana33xc20_prepare()
210 		pm_runtime_put_autosuspend(panel->dev);  in atana33xc20_prepare()
213 	p->prepared = true;  in atana33xc20_prepare()
222 	struct dp_aux_ep_device *aux_ep = to_dp_aux_ep_dev(panel->dev);  in atana33xc20_get_modes()
225 	pm_runtime_get_sync(panel->dev);  in atana33xc20_get_modes()
227 	if (!p->edid)  in atana33xc20_get_modes()
228 		p->edid = drm_get_edid(connector, &aux_ep->aux->ddc);  in atana33xc20_get_modes()
229 	num = drm_add_edid_modes(connector, p->edid);  in atana33xc20_get_modes()
231 	pm_runtime_mark_last_busy(panel->dev);  in atana33xc20_get_modes()
232 	pm_runtime_put_autosuspend(panel->dev);  in atana33xc20_get_modes()
258 	struct device *dev = &aux_ep->dev;  in atana33xc20_probe()
263 		return -ENOMEM;  in atana33xc20_probe()
266 	panel->supply = devm_regulator_get(dev, "power");  in atana33xc20_probe()
267 	if (IS_ERR(panel->supply))  in atana33xc20_probe()
268 		return dev_err_probe(dev, PTR_ERR(panel->supply),  in atana33xc20_probe()
271 	panel->el_on3_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);  in atana33xc20_probe()
272 	if (IS_ERR(panel->el_on3_gpio))  in atana33xc20_probe()
273 		return dev_err_probe(dev, PTR_ERR(panel->el_on3_gpio),  in atana33xc20_probe()
276 	panel->no_hpd = of_property_read_bool(dev->of_node, "no-hpd");  in atana33xc20_probe()
277 	if (!panel->no_hpd) {  in atana33xc20_probe()
278 		panel->hpd_gpio = devm_gpiod_get_optional(dev, "hpd", GPIOD_IN);  in atana33xc20_probe()
279 		if (IS_ERR(panel->hpd_gpio))  in atana33xc20_probe()
280 			return dev_err_probe(dev, PTR_ERR(panel->hpd_gpio),  in atana33xc20_probe()
294 	drm_panel_init(&panel->base, dev, &atana33xc20_funcs, DRM_MODE_CONNECTOR_eDP);  in atana33xc20_probe()
297 	ret = drm_panel_dp_aux_backlight(&panel->base, aux_ep->aux);  in atana33xc20_probe()
304 	drm_panel_add(&panel->base);  in atana33xc20_probe()
311 	struct device *dev = &aux_ep->dev;  in atana33xc20_remove()
314 	drm_panel_remove(&panel->base);  in atana33xc20_remove()
315 	drm_panel_disable(&panel->base);  in atana33xc20_remove()
316 	drm_panel_unprepare(&panel->base);  in atana33xc20_remove()
318 	kfree(panel->edid);  in atana33xc20_remove()
323 	struct device *dev = &aux_ep->dev;  in atana33xc20_shutdown()
326 	drm_panel_disable(&panel->base);  in atana33xc20_shutdown()
327 	drm_panel_unprepare(&panel->base);  in atana33xc20_shutdown()